Deprecated remaining code related to RestContext, RestApiMetadata, and RestClientModule for ApiContext, HttpApiMetadata, HttpApiModule
migrated sts and route53 entirely off deprecated async interfaces
decoupled code that requires async apis from keystone
decoupled code that requires async apis from cloud identity
quarantined openstack api and providers that still use async code
removed async api from cloudloadbalancers
removed async api from dynect
removed async api from ultradns-ws
Merge pull request #1511 from jclouds/async-is-an-option

remove requirement to support AsyncApi